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- Publisher Website: 10.1016/j.jdent.2009.11.003
- Scopus: eid_2-s2.0-76349122202
- PMID: 19941930
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Article: Degraded prism sheaths in the transition region of hypomineralized teeth
Title | Degraded prism sheaths in the transition region of hypomineralized teeth | ||||||||
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Authors | |||||||||
Keywords | Enamel Hypomineralization Nanoindentation Transmission electron microscopy | ||||||||
Issue Date | 2010 | ||||||||
Publisher | Elsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent | ||||||||
Citation | Journal Of Dentistry, 2010, v. 38 n. 3, p. 237-244 How to Cite? | ||||||||
Abstract | Objectives: Failure of the enamel adjacent to the defects in teeth with molar incisor hypomineralization (MIH) limits the success rate of the restorations placed in these teeth and this frequently leads to their ultimate extraction. To understand the cause, a state-of-the-art combination of focused ion beam (FIB) and nanoindentation techniques was used to evaluate the fracture properties and microstructure of enamel from specific regions of two MIH teeth. Methods: Nanoindentation, bend tests on micro-cantilevers and transmission electron microscopy (TEM) were employed to compare the microstructure and mechanical properties of the unaffected, opaque and transitional region in two MIH teeth. Special attention was paid to the transitional region in all the experiments in an attempt to identify its role in affecting the overall integrity of the MIH teeth. Results: The enamel in the transitional region, despite its translucent appearance under the naked eye, was found, under TEM, to have prism sheaths that were significantly less mineralized than unaffected enamel and were proved to be weaker in holding the prisms together when measured using bend tests on micro-cantilever samples machined from the region. Conclusion: The enamel in the transitional region adjacent to the demarcated defects in MIH has notable alterations in their prism sheaths which likely contribute to their lowered mechanical properties. © 2009 Elsevier Ltd. All rights reserved. | ||||||||
Persistent Identifier | http://hdl.handle.net/10722/65953 | ||||||||
ISSN | 2023 Impact Factor: 4.8 2023 SCImago Journal Rankings: 1.313 | ||||||||
ISI Accession Number ID |
Funding Information: This investigation was supported by a grant from the University Grants Committee (Project No. SEG-HKU06) of the Hong Kong Special Administrative Region, PR China, as well as a grant from the University of Hong Kong (Project No. 10208242.16180.14500). A.H.W. Ngan is grateful to the Croucher Foundation for support in the form of a Senior Research Fellowship. | ||||||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chan, YL | en_HK |
dc.contributor.author | Ngan, AHW | en_HK |
dc.contributor.author | King, NM | en_HK |
dc.date.accessioned | 2010-09-06T05:42:22Z | - |
dc.date.available | 2010-09-06T05:42:22Z | - |
dc.date.issued | 2010 | en_HK |
dc.identifier.citation | Journal Of Dentistry, 2010, v. 38 n. 3, p. 237-244 | en_HK |
dc.identifier.issn | 0300-5712 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/65953 | - |
dc.description.abstract | Objectives: Failure of the enamel adjacent to the defects in teeth with molar incisor hypomineralization (MIH) limits the success rate of the restorations placed in these teeth and this frequently leads to their ultimate extraction. To understand the cause, a state-of-the-art combination of focused ion beam (FIB) and nanoindentation techniques was used to evaluate the fracture properties and microstructure of enamel from specific regions of two MIH teeth. Methods: Nanoindentation, bend tests on micro-cantilevers and transmission electron microscopy (TEM) were employed to compare the microstructure and mechanical properties of the unaffected, opaque and transitional region in two MIH teeth. Special attention was paid to the transitional region in all the experiments in an attempt to identify its role in affecting the overall integrity of the MIH teeth. Results: The enamel in the transitional region, despite its translucent appearance under the naked eye, was found, under TEM, to have prism sheaths that were significantly less mineralized than unaffected enamel and were proved to be weaker in holding the prisms together when measured using bend tests on micro-cantilever samples machined from the region. Conclusion: The enamel in the transitional region adjacent to the demarcated defects in MIH has notable alterations in their prism sheaths which likely contribute to their lowered mechanical properties. © 2009 Elsevier Ltd. All rights reserved. | en_HK |
dc.language | eng | en_HK |
dc.publisher | Elsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent | en_HK |
dc.relation.ispartof | Journal of Dentistry | en_HK |
dc.subject | Enamel | en_HK |
dc.subject | Hypomineralization | en_HK |
dc.subject | Nanoindentation | en_HK |
dc.subject | Transmission electron microscopy | en_HK |
dc.subject.mesh | Dental Enamel - pathology - ultrastructure | - |
dc.subject.mesh | Dental Enamel Hypoplasia - pathology | - |
dc.subject.mesh | Elastic Modulus | - |
dc.subject.mesh | Incisor - pathology | - |
dc.subject.mesh | Molar - pathology | - |
dc.title | Degraded prism sheaths in the transition region of hypomineralized teeth | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0300-5712&volume=38&issue=3&spage=237&epage=244&date=2010&atitle=Degraded+prism+sheaths+in+the+transition+region+of+hypomineralized+teeth | en_HK |
dc.identifier.email | Ngan, AHW: hwngan@hkucc.hku.hk | en_HK |
dc.identifier.email | King, NM: hhdbknm@hkucc.hku.hk | en_HK |
dc.identifier.authority | Ngan, AHW=rp00225 | en_HK |
dc.identifier.authority | King, NM=rp00006 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.jdent.2009.11.003 | en_HK |
dc.identifier.pmid | 19941930 | - |
dc.identifier.scopus | eid_2-s2.0-76349122202 | en_HK |
dc.identifier.hkuros | 193241 | en_HK |
dc.identifier.hkuros | 168959 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-76349122202&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 38 | en_HK |
dc.identifier.issue | 3 | en_HK |
dc.identifier.spage | 237 | en_HK |
dc.identifier.epage | 244 | en_HK |
dc.identifier.isi | WOS:000275576200009 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Chan, YL=8250546500 | en_HK |
dc.identifier.scopusauthorid | Ngan, AHW=7006827202 | en_HK |
dc.identifier.scopusauthorid | King, NM=7201762850 | en_HK |
dc.identifier.citeulike | 6245597 | - |
dc.identifier.issnl | 0300-5712 | - |